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Nickel/metal hydride batteries using rare-earth hydrogen storage alloy

Published online by Cambridge University Press:  03 March 2011

J. Chen  and
Y.S. Zhang
J. Chen
Affiliation:
Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, People's Republic of China
Y.S. Zhang
Affiliation:
Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, People's Republic of China
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Abstract

Fine particles of a hydrogen storage alloy (LaNi3.8Co0.5Mn0.4Al0.3) were microencapsulated with a thin film of nickel of about 0.6 μm thickness. The microencapsulated alloy powders were used as an anode material in a sealed nickel/metal hydride battery. The battery characteristics were compared with those of a battery with a bare (uncoated) alloy anode. The battery using the bare alloy was less stable compared to the coated alloy due to the role of the coated nickel as an oxygen barrier for protecting the alloy surface from oxidation. In addition, charge-discharge characteristics were improved greatly by the nickel coating, especially at high rates and at low temperatures due to the role of nickel as a microcurrent collector. So the microencapsulation of the alloy powders improves the performances of the alloy electrode.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 7 , July 1994 , pp. 1802 - 1804
Copyright
Copyright © Materials Research Society 1994

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References

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